The Clean Air Act Amendments of 1990 encourage states to pursue market-based approaches to improve air quality. An Accelerated Vehicle Retirement (AVR) program, commonly referred to as "Cash for Clunkers," is designed to provide an economic incentive for the owners of highly polluting vehicles to retire their automobiles permanently from use and to provide greater flexibility for private industry to reduce emissions by sponsoring such a program. The implementation of AVR programs can be controversial. This report discusses the AVR program debate and includes information on completed AVR pilot projects in selected states.
This report discusses the effect of human activities on global climate change. Human activities, particularly burning of fossil fuels, have increased atmospheric carbon dioxide (CO2) and other trace gases, including chlorofluorocarbons (CFCs), methane, and nitrous oxide.
For two decades, scientists have been warning that chlorofluorocarbons (CFCs) and Halons (bromine-containing fluorocarbons) may deplete the stratospheric ozone shield that screens out some of the sun's harmful ultraviolet rays and thus regulates the amounts which reach the Earth's surface. CFCs have been used as refrigerants, solvents, foam blowing agents, and outside the United States as aerosol propellants; Halons are used primarily as firefighting agents. Increased radiation could result in an increase in skin cancers, suppression of the human immune system, and decreased productivity of terrestrial and aquatic organisms, including some commercially important crops.
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